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License Agreements and Acquired Product Rights - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Apr. 04, 2019
Indefinite-lived Intangible Assets [Line Items]
Product samples purchased	$ 23,360	$ 13,489	$ 62,304	$ 41,013
Shiongi License And Supply Agreement \| Symproic License
Indefinite-lived Intangible Assets [Line Items]
Upfront payment first installment to be made					$ 20,000
Upfront payment installment henceforth to be made					$ 10,000
Product samples purchased			$ 400
Shiongi License And Supply Agreement \| Symproic License \| Additional Royalty As A Percentage
Indefinite-lived Intangible Assets [Line Items]
Tiered royalty payment as a percentage of sales	1.00%
Shiongi License And Supply Agreement \| Royalty Agreement Terms \| Symproic License \| Maximum
Indefinite-lived Intangible Assets [Line Items]
Tiered royalty payment as a percentage of sales	17.50%
Shiongi License And Supply Agreement \| Royalty Agreement Terms \| Symproic License \| Minimum
Indefinite-lived Intangible Assets [Line Items]
Tiered royalty payment as a percentage of sales	8.50%